Vacuum-jacketed metal vessel



E. s. ANDREWS. VACUUM JACKETED METAL VESSEL.

APPLICATION FILED DEC. 16, 1919.

1,368,877, Patented Feb. 15,1921.

117 ea/or STATES Paar EWART SIGMUNI) ANDREWS, F BEGKENHAM, ENGLAND.

VACUUM-JACKETED METAL VESSEL.

Application filed December 16, 1919.

To all whom it may concern:

Be it known that I, EwAR'r SIGMUND AN- nnnws, a subject of the King of Great Britain, residing at Moyders, 22 Manor Way, Beckenham, in the county of Kent, England, have invented certain new and useful Improvements in Vacuum-Jacketed Metal Vessels, of which the following is a specification.

This invention relates to vacuum-jacketed metal vessels which are employed for holding hot or cold liquids so as to reduce to a minimum the loss or gain of heat of the liquid, and are particularly applicable to holding air, oxygen or other gases in a liquid state.

It is usual to provide such vessels in the side or bottom with a metal sealing-off tube, which is usually of lead, so that after the space between the inner and outer walls of the vessel has been evacuated the tube may be closed to maintain the space in the evacuated condition; but in a vacuum-jacketed vessel with a metallic outer shell and glass inner body it has been proposed to place a glass sealing-off tube in the neck so as to project radially.

According to this invention a metal sealing-oif tube is placed in the neck of the vessel and is arranged to project in a direction substantially tangential to the neck.

An advantage of this arrangement is that the tube, which usually has to be bent back after evacuationin order to cover it with a Specification of Letters Patent.

Patented Feb. 15, 1921.

Serial No. 345,222.

soldering or otherwise, to a metal thimble Z) which is connected to the outer neck tube 0, the latter being provided with a hole as shown so that the sealing-off tube a connects to the space between the inner and outer necks c, 03-

The thimble Z) is shown placed just above the strengthening cone f which is usually provided in vessels of this kind, but it may if desired be placed inside this cone which would then be made detachable or provided with means of access to the tube a.

A detachable cup 6 may be provided for protecting the tube a from being tampered with after sealing-off has been effected.

For evacuation of the space between the inner and outer vessels, the tube a is unwound from the neck and its open end is connected to the vacuum pump; when the desired degree of exhaustion has been reached, the end of the tube a is sealed and V the tube is then bent around the neck 0 as a mandrel.

By vacuum-jacketed metal Vessels, I mean a vacuiun-jacketed vessel in which the outer vessel is made of metal or both inner and outer vessels are made of metal.

Claims:

1. In a vacuum-jacketed vessel, a metal sealing-off tube adapted to be bent around the neck of the vessel as a mandrel after sealing-01f.

2. In a vacuum-jacketed metal vessel, a metal sealing-off tube projecting in a direction substantially tangential to the neck of the vessel from a thimble secured to the neck and giving access to the vacuum space.

3. In a vacuum-jacketed metal vessel the combination of a metal sealing-oil tube which projects from the neck of the vessel in a direction substantially tangential to the neck and a cap adapted to be placed on the neck to protect the sealing-off tube from inury. J In testimony whereof I afi'ix my signature.

EWART SIGMUND ANDREWS. 

